US 12,244,148 B2
Load sharing for multiple auxiliary low voltage buses of vehicles
Mohamed Ahmed Kamel Ahmed, Birmingham, MI (US); Robert A. De Stefano, Macomb Township, MI (US); and Jun-mo Kang, Ann Arbor, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Feb. 16, 2023, as Appl. No. 18/170,220.
Prior Publication US 2024/0283247 A1, Aug. 22, 2024
Int. Cl. H02J 3/14 (2006.01); B60R 16/033 (2006.01); H02J 1/00 (2006.01); H02J 1/14 (2006.01)
CPC H02J 3/14 (2013.01) [B60R 16/033 (2013.01); H02J 1/00 (2013.01); H02J 1/14 (2013.01); H02J 2310/48 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A method for load sharing for multiple auxiliary low voltage buses of a vehicle, the method comprising:
providing a first electric power pathway from a battery to a first auxiliary low voltage bus via a first direct-current (DC)/DC converter and a first switch, wherein electrical power is provided at a first voltage level for the first auxiliary low voltage bus;
providing a second electric power pathway from the battery to a second auxiliary low voltage bus via a second DC/DC converter and a second switch, wherein electrical power is provided at a second voltage level for the first auxiliary low voltage bus, the second voltage level differing from the first voltage level;
selectively controlling at least one of the first switch or the second switch to manage a load in one of the first auxiliary low voltage bus or the second auxiliary low voltage bus based at least in part on the battery; and
selectively controlling, by a controller, at least one of an output voltage or an output current of at least one of a first grid associated with the first auxiliary low voltage bus or a second grid associated with the second auxiliary low voltage bus, the at least one of an output voltage or the output current being based on a balancing condition expressed by the following equation:

OG Complex Work Unit Math
where vA is an output voltage across a first grid associated with the first auxiliary low voltage bus, vB is an output voltage across a second grid associated with the second auxiliary low voltage bus, CRA is a resistance across the first grid, CRB is a resistance across the second grid, CPA is a power across the first grid, and CPB is a power across the second grid.